Coherence lengths and anisotropy in MgB2 superconductor

Details Coherence lengths and anisotropy in MgB2 superconductor Coherence lengths and anisotropy in MgB2 superconductor

2002-07-26

arxiv.org/abs/cond-mat/0207655v1

Phys. Rev. B 67, 020507(R) (2003)

Physics

Condensed Matter

Superconductivity

submitted to PRL

Scientific paper

10.1103/PhysRevB.67.020507

Field and temperature microwave measurements have been carried out on MgB2 thin film grown on Al2O3 substrate. The analysis reveals the mean field coherence length xi_{MF} in the mixed state and a temperature independent anisotropy ratio gamma_{MF} = xi_{MF}^{ab} / xi_{MF}^c approximately 2. At the superconducting transition, the scaling of the fluctuation conductivity yields the Ginzburg-Landau coherence length with a different anisotropy ratio gamma_{GL} = 2.8, also temperature independent.

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